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MAGNETIC TAPE

  • US 20190027174A1
  • Filed: 07/17/2018
  • Published: 01/24/2019
  • Est. Priority Date: 07/19/2017
  • Status: Active Grant
First Claim
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1. A magnetic tape comprising:

  • a non-magnetic support;

    a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent on one surface side of the non-magnetic support; and

    a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical squareness ratio of the magnetic tape is 0.65 to 1.00,the back coating layer includes one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide, anda C—

    H derived C concentration calculated from a C—

    H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %.

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